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34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
;-------------------------------
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; #GAMCO
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; bad block check POKEd into memory
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; from compiled BASIC
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; e.g. Essential Grammar, Math Football
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;-------------------------------
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!zone {
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bit gMode ; nothing to do here in verify-only mode
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bpl .exit
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; [speed optimization: only ever seen this protection on disks with
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; a specific nibble sequence on track $22, or an unformatted T22 --
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; if this global variable is set in SkipTrack() after failing to read T22S0F,
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; then we scan every other track for the Gamco protection code]
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lda gPossibleGamco
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bne .exit
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ldy #$12
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jsr SearchTrack
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!byte $33,$32,$01,$30,$03,$31,$39,$31
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!byte $03,$31,$32,$38,$02,$31,$31,$02
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!byte $39,$36
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bcs .exit
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sta gDisplayBytes
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pha
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lda #s_poke
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jsr PrintByID
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pla
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ldy #$12
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jsr modify
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!byte $34,$34,$01,$30,$02,$31,$30,$03
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!byte $32,$33,$34,$03,$31,$36,$39,$02
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!byte $33,$39
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.exit
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}
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